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Laundry detergent fluorescing under ultraviolet light. Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) through the ...
Unlike gravitational macrolensing where the lens is a galaxy or cluster of galaxies, in microlensing u changes significantly in a short period of time. The relevant time scale is called the Einstein time t E {\displaystyle t_{E}} , and it's given by the time it takes the lens to traverse an angular distance θ E {\displaystyle \theta _{E ...
An idealized case of limb darkening. The outer boundary is the radius at which photons emitted from the star are no longer absorbed. L is a distance for which the optical depth is unity.
Images can be brightened and manipulated in a computer to adjust color and increase the contrast. More sophisticated techniques involve capturing multiple images (sometimes thousands) to composite together in an additive process to sharpen images to overcome atmospheric seeing , negating tracking issues, bringing out faint objects with a poor ...
If implemented, the cooling effect is expected to be felt rapidly and to be reversible on fairly short time scales. However, technical barriers remain to large-scale marine cloud brightening. There are also risks with such modification of complex climate systems.
One of Eddington's photographs of the 1919 solar eclipse experiment, presented in his 1920 paper announcing its success. Henry Cavendish in 1784 (in an unpublished manuscript) and Johann Georg von Soldner in 1801 (published in 1804) had pointed out that Newtonian gravity predicts that starlight will bend around a massive object [15] as had already been supposed by Isaac Newton in 1704 in his ...
Pyrops lathburii is a variable species. [3] [4] Its head, thorax, and abdomen range from brown to black, its hindwings from yellow to white, the apex of its cephalic process from yellow to red, and the tegmen all the way from white with unmargined black spots to black or very dark with yellow, margined spots and green veins.